Vibrator device



G. L. CANNON VIBRATOR DEVICE Filed Jan. 2, 1950 'i I INVENTOR. 7;7'3 Guy canna/Z ATTORNE .5,

Patented Aug. 16, 1932 PTENr GUY L.,.CANNON, 0F EAST CLEVELAND, OHIO VIBRATOR DEVICE g applicati@ tied January 2,1930. serial` No. 417,903.

In vibrator devices having a piston reciprocated by compressed air, itV has heretofore been customary to either mount the device on a slant so that gravity would always leave the piston in a starting position, or a suitably heavy spring was employed for such purpose. In tliecase of slant mounting, the efliciency of the device is found to be very much diminished, since the directionof thrust is diverted. Furthermore, with `such construction, the device must stand at Asuch an awkward position as to be `decidedly in the way, and prohibitively so forv some usages. In the case of a spring-set piston, other difficulties arise. By vreason of the spring bias, the piston stroke is, unbalanced, and the eiciency is found to be cutdown. Moreover, a spring in suoli heavy duty position, is subjected to punishment to such extent as to occasion frequent breakage, and consequent delays'and repairs. Such springs also weaken and occasionallystick. A vibrator construction eliminating all such difliculties, and making possible a simple and reliable type f of construction and operation is accordingly fundamentally important and highly desirable. l

To the accomplishment of theA foregoing and related ends, the invention, then, consists of the features hereinafter fullydescribed, and particularly pointed out inthe claims,

the following description and theanneXed drawing setting forth in detail certain structurev embodying theI invention,such being illustrative however of but one of the various ways in which the principleof the invention may be employed. In said annexed drawingz p Fig. 1 is a side elevational View of anembodiment of the invention; Fig. 2 is an axial sectional view thereof; and Fig. 3 is a similar view showing the operating parts in another position.

' Referring more particularly to the drawing, there 'is shown a housing 1, which may be of any convenient forni with reference to the members to be included, and within such housing a plunger 2 is arranged for re- VMciprocatory motion, the plunger-chamber being closed vat its vends'by'convenient means,

for instance a screw plug 3 with awrenchhold head, and a screw plug-4 with'anl openj ing to receive a connecting bolt for joining the device to a mold plate or other object to receive the vibratory force. In association with the plunger 2 are ports 6 and 7'for communication tothe respective ends, and the plunger is desirably provided .with circumferential grooves 8, 9, andfrom these respectively, openings 10, 11 communicate to the space at the ends of the plunger. Thecircuiiiferential grooves 8, 9, are spacedmore closely than the corresponding ports 6, 7, or at least such that only one groove at a time. can communicate with the inlet, viz., the groove of the end whichhas been exhausted. Exhaust ports 12, 13, in the housing are spaced in turn more closely than'thegrooves 8, 9, or at least such that each will register withA a "corresponding groove vfor exhaustat the end of the inward excursion of movement 'for such groove as carried by the` dead center, so as to insure proper starting, is

provided. In the form shown, this comprises a member movable to and fro to control access to the port at one end, and in the detail here, embodies a valve 15 mounted in a bore 16 andbacked up by a Spring 17, conveniently a coil spring seating about a reduced end of the" valve and bearing against a shoulder thereof at one end, and against a backing plate 18 at the other. VSuch backing plate` may conveniently take the form of a Washer-like member 19 engageable'under the head of the plug 3 and having a lug extension to overlie` i..

the spring. The valve 15 hasa cutout 20 at its end facing the pressure-Huid supply, such' cutout being proportioned to register' with port 6 when the valve is in one position, the' port however being put in communication with an extension duct or' port 21 when the valve is in its other position. A groove 2 2 or other -suitable communicating f passageway cooperates with this latter. To maintain the cutout20 in proper alignment', an aligning or splining slot 23 is provided, and an `align- '5 The manner of operationof the device Will be readily understood from the foregoing. Being connected to an object to be operated upon,for instance the plate of a molding machine in foundry usage, or a portion of a concrete form in cement-molding usage orthe like, pressure fluid, usually-air for instance at a pressure of about 'T0-8O pounds per square inch, is admitted by the control of 'zi/master valve in the pipe 14. The spring Y17 norinally vmaintains the valve 15 in a position to blookfcommunication to fthe port 6,;and as long yas the pressure .isshut off in the pipe 11i, the ports Will be at rest in the position kshown in Fig. 3. But when new the master valve in thepipe is opened to allowthe fluid to enter, theport 7 being blocked by the Vpiston 2, theback-lash of pressure momentarily foroesthe valve 15 back against the spring 17 to its position s hoivnin Fig. 2. At this instant the 'plunger 2 happens to still be in the :dotted line position shown in Fig. 2, the

opening 10 off -t-he plunger being in line with port, and thus the'rprcssure fluid takes the path through port Gland opening lOand out to .the left -hand endA of the vplunger 2. im-

mediately .the plunger/is forced over to the e right or :its full line position shown lin Fig. 2,:andvon-the'movement ofthe groove 8,` coinmn'nication with the port 6 is first cut oii and then communication with Vthe exhaust port 12 `is opened, thereby exhausting the cli-arge of flu-id from that end of the plunger chain ber. Mea-n-While, the spring 17 has thrown the valve 15 back tothe right. Pressure uid now enters port '7 kand the grooif'e v9 as it comes into registry, andy thence proceeds through the opening 11-to the right hand end of tie plunger. rlhe left Vend of the plunger being exhausted, the vpressure `fluid at the right throws the plunger back to the left, and 'the niovinggroove '9 first cuts off' the inletvport 7 and theneXhausts through port 13. Port G is p-ut infcommunication ivithopening 10, and since the -i'falve'lsets with the groove 22 and passivay 4v21 aligned, final exhaust of the left end of the plu-nger 2 is insured, and 'a'cycle is completed. It will be observed also that when the pressure-fluid is shut ofi in pipe 11i, sinoeAthe-.spring 17 biases the valve 15 into position With the groove Y22 aligned -vvith auniliar. assWfa or vent 21 dead-centering of' Vthe plunger 2 is prevented, and relief or eX- haust ofthe left end of theY plunger through the-feed'port 6 leaves the 4plunger uniformly f in the position shown in Fig. 3, ready for a reoccurrence of the cycle starting with the forcing valve 15 back, and so on,`as above set forth. Cyclic movement, and rapidreci-procation of the plu-nger l2 is thus had, the parl tioula-r :effects being gauged by the proper port 6 to provide final positioning of the parts as shown in Fig. 3, and the device is -alvvays-ready for starting; with entire elimination of difiiculties from dead-centering, etc.7 and Without imbalance.

By reason of trie uniform action at both ends of the plunger, highly eflicient application of power ishad, so that small units develop a surprisingly large amount yof power. Other modes of applying the principle of the invention may be employed, change `being made as regards the details described, provided the means stated in any of the following claims, or lthe equivalent of such, be employed. I

I therefore particularly point out and `distinctly Vclaim -as my invention Y 1. A fluid motor, comprising a housing, `a plunger'reciprocable therein, Aports for supplying-pressure uid'to eachend ofthe plung er, an linlet communicating with said ports, an exhaust-vent communicable with one such supplyport, amember in relation With said eX-ha-ust-vent-and said last-named supply-.port held byfluid-pressure When the line-pressure is on whereby to open the :inletto said supply-port and close the vent, resilient means to move said member when the .linepressure is off Wherebyvto close `the inlet to said supply-port and open the vent.

'2. A fluid motor, comprising a housing, 'a

plunger reciprocable therein, `ports, for Asupplyof pressure fluid to each Vend of :the plunger, an inlet communicating With said Ports, an exhaust-vent aligned with one such supplyport, a member in relation With the said eX-. haust-vent and said last-named supply-port held by fluidepressure when the line-pressure is on whereby to open Ythe inlet to said supplyport .and close the vent, and resilient means to nieve said .member When the line-,pressure is ofi Wherebyto close the inlet to-said supplyport and openthe vent.

3. A iuid motor, comprising a housing, :a plunger reciprocable therein, ports "for supplying pressure fluid to each end ofthe plunger, discharge ports for exhaust after each respective stroke of said plunger, a valve guarding one such supply port, said valve having a cutout to allow entry of pressure fluid when in retractedposition and a groove to allow eXit of exhaust fluid when in ad-v vanced position, an auxiliary vent with Which such groove may register When the valve is in advanced position, and resilient means for urging-said valve to advanced position. y

et. Afluid motor, Ycomprising a housing, aV

plunger reciprocable therein, ports for sup- Y plying pressure fiuid to each end of the plunger, discharge ports for exhaust after each respective stroke of said plunger, a valve guarding one such supply port, said valve having a Vcutout to allow entry of pressure iuid when in retracted position and a groove to allow exit of exhaust fluid when in advanced position, an auxiliary vent with which such groove may register when the valve is in advanced position, an aligning slot in said valve, an aligning pin controlling said slot, and resilient means for urging said valve to advanced position. Y

5. A fluid motor, comprising a housing, means for connecting said housing to a'plate to be vibrated, a plunger reciprocable in said housing, ports for supplying pressure fluid to each end of the plunger, said plunger having circumferential grooves each alternately registerable with one of such ports and openings from each groove to the corresponding end of the plunger, a pair of exhaust ports in the housing each registerable alternately with one of such grooves, a valve guarding the pressure fluid entry port for one end of said plunger, said valve having a cutout to allow entry of pressure fluid when in retracted position and a groove to allow exit of exhaust fluid when in advanced position, an auxiliary vent with which said groove may register when the valve is in advanced position, andA resilient means for urging said valve to advanced position.

6. A valve construction for a fluid motor, comprising a housing, a reciprocable valve member mounted therein, and resilient means normally holding said member at one end of its stroke, aligned ports located diametrally of said member in the housing, and a feed inlet at the end of said valve member, said valve member when at the aforementioned end of the stroke blocking communication between the feed and one of said ports, while establishing communication between such laterally aligned ports.

7. In a valve construction for fluid motors, a housing, a reeiprocable valve member mounted therein, aligned ports located diametrally of said member in the housing, and a feed openinof at the end 01"' said valve member, said mem er having a cutout at the end to establish connection between the feed opening and one of said ports when in one position, said member having also a groove for communicating with the'diametrally aligned ports when in another position, and means for preventing rotary motion of said member, said means including a splining slot in the member and a coacting screw-adjusted pin in the housing.

Signed by me this 28th day of December,

GUY L. CANNON. 

